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Old 24 July 2019, 09:02   #21
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Quote:
Originally Posted by AndyMc View Post
I've got a Suzuki 6hp on mine. It fits next to the 140HP ok, but I'm not sure anything much bigger would fit without causing issues.



It pushes the boat along at 6knts WOT on flat water. About 4knts when dialed down to about 3/4 throttle. Personally, I wouldn't want to go with anything much smaller than that.



BTW, the previous owner ordered the boat from Ribcraft with the aux already installed. However, I don't know whether it was him or Ribcraft that came up with the engine choice.


Is that a 4-stroke?
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Old 24 July 2019, 09:17   #22
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Is that a 4-stroke?
Yes, 4-stroke.
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Old 24 July 2019, 15:14   #23
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Can convert any 2 strokes 6-8-HP Tohatsu or rebadged Mercs by installing the 9.8 carb + slight more time advance. Will need to install at least one less pitch prop from the standard factory delivered one to push a lot better a larger Rib at fast displacement speed when encountering naughty sea conditions.

A Tohatsu/Merc 9.8 is a nice portable alternative to put and retrieve, all 6-8-9.8 HP have same 170 CC powerhead, just carb and time advance detuned. Don't put your lives at jeopardy by saving money buying small potable motors to be uses as aux. Those are good to power just anything that floats on flat calm no wind water cond..

Happy Boating
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Old 24 July 2019, 16:38   #24
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Quote:
Originally Posted by Nos4r2 View Post
The idea of an auxiliary is that when your main engine stops, the aux ALWAYS works.


(I'll just leave that there...)
You beat me to it Nos!
In a emergency the warm glow of having saved a few quid....would pretty soon (probably instantly!) evaporate if the thing failed
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Old 25 July 2019, 13:43   #25
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Yeah - you guys are probably right. Just need to find the right motor. Iíd favor a two-stroke though for the lighter weight and easier storage / servicing.
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Old 27 July 2019, 13:36   #26
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Shortshaft Yamaha 8c if you can find a good one. Uprated version of the 6c, nice and light.
Pushed my Ballistic 7.8 at 6 knots, and makes my 2.9m sib plane

It really doesnt matter having a short shaft btw, the offset to one side and the V of the hull means the prop is in clear water-and a decent (20hp rated) adjustable aux bracket will set it back nicely. It'd be worse weather than an aux could cope with before it lost grip.
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Old 27 July 2019, 14:15   #27
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Quote:
Originally Posted by Nos4r2 View Post
Shortshaft Yamaha 8c if you can find a good one. Uprated version of the 6c, nice and light.
Pushed my Ballistic 7.8 at 6 knots, and makes my 2.9m sib plane

It really doesnt matter having a short shaft btw, the offset to one side and the V of the hull means the prop is in clear water-and a decent (20hp rated) adjustable aux bracket will set it back nicely. It'd be worse weather than an aux could cope with before it lost grip.
Plus 1 shortshaft well up the dead rise next to the tube plenty of water to feed it
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Old 27 July 2019, 19:34   #28
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Short shaft on ribcraft 6.8 was beyond useless, it was literally a hair dryer it was in the air so much on calm day I was on it. Boat now has LS yamaha 8 2 stroke and works well in most conditions I'm told. If the 585 is anything like the 6.8 then it would be better getting a long shaft.
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Old 28 July 2019, 18:10   #29
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I prefer mounting the aux direct in the transom, and I measured 52 cm from the top of the transom to clear the hull. The A frame stops you mounting closer to the tubes. So I think I still need a long shaft.
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Old 29 July 2019, 02:34   #30
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Cheap outboard for aux?

Quote:
Originally Posted by Bucksribster View Post
I prefer mounting the aux direct in the transom, and I measured 52 cm from the top of the transom to clear the hull. The A frame stops you mounting closer to the tubes. So I think I still need a long shaft.


Good idea to measure depth of transom. On my 7.8 my Suzuki bracket didnít open wide enough to fit on and needed bracket. Alternative was to muck about with transom which I didnít want to do
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